VALIDATION OF A NEW HAND-HELD TRANSCUTANEOUS ARTERIAL TONOMETER FOR A NON-INVASIVE EVALUATION OF BLOOD PRESSURE VALUES, PULSE WAVE MORPHOLOGY AND CENTRAL HEMODYNAMIC PARAMETERS

2004 ◽  
Vol 22 (Suppl. 1) ◽  
pp. S130-S131
Author(s):  
P. Salvi ◽  
G. Lio ◽  
E. Riccl ◽  
C. Labat ◽  
A. Benetos
Keyword(s):  
Blood Pressure ◽  
Pulse Wave ◽  
Hemodynamic Parameters ◽  
Non Invasive ◽  
Central Hemodynamic ◽  
Wave Morphology ◽  
Invasive Evaluation

Non-Invasive Monitoring of Hemodynamic Parameters during Hemodialysis

1995 ◽  
Vol 18 (9) ◽  
pp. 499-503 ◽  
Author(s):  
F. Pizzarelli ◽  
P. Dattolo ◽  
M. Piacenti ◽  
M.A. Morales ◽  
T. Cerrai ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Cardiac Output ◽  
Blood Volume ◽  
Impedance Cardiography ◽  
Hemodynamic Parameters ◽  
Non Invasive ◽  
Transthoracic Impedance ◽  
Cardiac Output Index ◽  
On Line ◽  
Two Parameters

We studied in 13 hemodialysis patients intradialytic variations of blood volume (BV) and cardiac output, by means of non-invasive methods. We found a weak correlation, r 0.2 or less, between BV variations and intradialysis blood pressure variations. The sensitivity of the former in describing the variations of the latter was only 32%. During the 30 min preceeding the hypotensive crisis the percent BV variations did not show any predictive trend. On the contrary, refilling increased as blood pressure dropped and a weak inverse relation (r -0.35) was found between these two parameters. Unstable patients had predialytic blood volume values significantly lower than stable ones and comparable to healthy subjects. On the contrary, the correlation between percent variations of cardiac output index and MAP was 0.68 with a sensitivity and specificity of 90% and 59%, respectively. Unfortunately these promising results were obtained only with an estimate of cardiac output obtained by echocardiography and not by transthoracic impedance cardiography, which is much more feasible than the former as on-line monitoring of cardiac output. On-line monitoring of hemodynamic parameters is an appealing but still unsolved task.

Influence of ageing on quantitative contrast-enhanced ultrasound of the kidneys in healthy cats

2018 ◽  
Vol 182 (18) ◽  
pp. 515-515 ◽  
Author(s):  
Emmelie Stock ◽  
Dominique Paepe ◽  
Sylvie Daminet ◽  
Luc Duchateau ◽  
Jimmy H Saunders ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Area Under The Curve ◽  
Renal Perfusion ◽  
Urine Specific Gravity ◽  
Contrast Enhanced Ultrasound ◽  
Non Invasive ◽  
Peak Enhancement ◽  
Contrast Enhanced ◽  
Lower Blood ◽  
Invasive Evaluation

The degenerative effects of ageing on the kidneys have been extensively studied in humans. However, only recently interest has been focused on renal ageing in veterinary medicine. Contrast-enhanced ultrasound allows non-invasive evaluation of renal perfusion in conscious cats. Renal perfusion parameters were obtained in 43 healthy cats aged 1–16 years old, and the cats were divided in four age categories: 1–3 years, 3–6 years, 6–10 years and over 10 years. Routine renal parameters as serum creatinine, serum urea, urine-specific gravity, urinary protein:creatinine ratio and systolic blood pressure were also measured. No significant differences in any of the perfusion parameters were observed among the different age categories. A trend towards a lower peak enhancement and wash-in area under the curve with increasing age, suggestive for a lower blood volume, was detected when comparing the cats over 10 years old with the cats of 1–3 years old. Additionally, no significant age-effect was observed for the serum and urine parameters, whereas a higher blood pressure was observed in healthy cats over 10 years old.

scholarly journals Characterising the Photoplethysmography Pulse Waveform for Use in Human Neuroscience: The Hybrid Excess and Decay (HED) Model

2021 ◽  
Author(s):  
Simon Williamson ◽  
Lucie Daniel-Watanabe ◽  
Johanna Finnemann ◽  
Craig Powell ◽  
Adam Teed ◽  
...  
Keyword(s):  
Pulse Wave ◽  
Blood Oxygenation ◽  
Pulse Waveform ◽  
Relevant Model ◽  
Systematic Analysis ◽  
Invasive Approach ◽  
Non Invasive ◽  
Sympathomimetic Drug ◽  
Wave Morphology ◽  
High Degree

Photoplethysmography (PPG) offers a widely-used, convenient and non-invasive approach to monitoring basic indices of cardiovascular function such as heart rate and blood oxygenation. However, while the pulse waveform, generated by PPG comprises features that are shaped by physiological and psychological factors, it is frequently overlooked in analyses of such data. We suggest that studies could be enriched by exploiting the possibilities afforded by a systematic analysis of PPG waveforms. To do this we initially require a robust and automated means of characterising it, thereby allowing us to examine variations across individuals and between different physiological and psychological contexts. We present a psychophysiologically-relevant model, the Hybrid Excess and Decay (HED) Model, which characterises pulse wave morphology in terms of three underlying pressure waves and a decay function. We show that these parameters capture PPG data with a high degree of precision and, moreover, are sensitive to specific, physiologically-relevant changes within individuals. We present the theoretical and practical basis for the model and demonstrate its performance when applied to a pharmacological dataset of 105 participants receiving intravenous administrations of the sympathomimetic drug isoproterenol (Isoprenaline). We conclude by discussing the possible value in using the HED model to complement standard measures of PPG outputs.

scholarly journals Arterial Flow and Diameter-based Blood Pressure Models-an In-silico Comparison

2021 ◽  
Author(s):  
Ana Carolina Gonçalves Seabra ◽  
Alexandre Ferreira da Silva ◽  
Thomas Stieglitz ◽  
Ana Belen Amado Rey
Keyword(s):  
Blood Pressure ◽  
In Silico ◽  
Model Comparison ◽  
Pulse Wave ◽  
Ex Vivo ◽  
Mean Difference ◽  
Arterial Tree ◽  
Non Invasive ◽  
Luminal Area ◽  
Ultrasound Sensor

<div>This paper investigates the best method for obtaining highly accurate blood pressure values in non-invasive measurements when using an ultrasound sensor. Deviations of the model should be less than 5 mmHg from the actual values. Different blood pressure models were analyzed and qualitatively compared. Relevant arterial parameters such as luminal area, flow velocity and pulse wave velocity, of 729 subjects were extracted from a computer simulated database and served as input parameters. Due to pulse wave variations through the arterial tree, such as viscoelasticity and arterial stiffness, the applied algorithms need to be specifically adapted to each arterial site. In-silico model comparison at different arterial sites were used to identify the parameters for individual equations that deduce the blood pressure at different arteries (carotid, brachial and radial). A linear model calibrated luminal area pulse wave to blood pressure and revealed to be most accurate model. The model was validated with a commercial pressure sensor in an ex-vivo experimental setup. The results showed an in-silico pulse pressure correlation of 0:978 and mean difference of (-2.134 ±2.477) mmHg at the radial artery and ex-vivo pressure correlation of 0:994 and mean difference of (0.554 ±2.315) mmHg.</div>

scholarly journals Noninvasive Assessment of Aortic Pulse Wave Velocity by the Brachial Occlusion-Cuff Technique: Comparative Study

Sensors ◽  
2019 ◽  
Vol 19 (16) ◽  
pp. 3467 ◽  
Author(s):  
Vratislav Fabian ◽  
Lukas Matera ◽  
Kristyna Bayerova ◽  
Jan Havlik ◽  
Vaclav Kremen ◽  
...  
Keyword(s):  
Blood Pressure ◽  
Pulse Wave Velocity ◽  
Wave Velocity ◽  
Gold Standard ◽  
Pulse Wave ◽  
Blood Pressure Monitor ◽  
Pressure Monitor ◽  
Gold Standard Method ◽  
Non Invasive ◽  
Occlusion Cuff

Cardiovascular diseases are one of most frequent cause of morbidity and mortality in the world. There is an emerging need for integrated, non-invasive, and easy-to-use clinical tools to assess accurately cardiovascular system primarily in the preventative medicine. We present a novel design for a non-invasive pulse wave velocity (PWV) assessment method integrated in a single brachial blood pressure monitor allowing for up to 100 times more sensitive recording of the pressure pulsations based on a brachial occlusion-cuff (suprasystolic) principle. The monitor prototype with built-in proprietary method was validated with a gold standard reference technique SphygmoCor VX device. The blood pressure and PWV were assessed on twenty-five healthy individuals (9 women, age (37 ± 13) years) in a supine position at rest by a brachial cuff blood pressure monitor prototype, and immediately re-tested using a gold standard method. PWV using our BP monitor was (6.67 ± 0.96) m/s compared to PWV determined by SphygmoCor VX (6.15 ± 1.01) m/s. The correlation between methods using a Pearson’s correlation coefficient was r = 0.88 (p < 0.001). The study demonstrates the feasibility of using a single brachial cuff build-in technique for the assessment of the arterial stiffness from a single ambulatory blood pressure assessment.

Problems of ensuring the uniformity of blood pressure measurements

Metrologiya ◽  
2020 ◽  
pp. 46-71
Author(s):  
V. F. Romanovskiy ◽  
A. M. Romanovskaya ◽  
E. A. Nenasheva
Keyword(s):  
Blood Pressure ◽  
Pulse Wave ◽  
Metrological Traceability ◽  
The Body ◽  
Pressure Measurements ◽  
Wave Method ◽  
Invasive Blood Pressure ◽  
Non Invasive ◽  
Measurement Results ◽  
Traceability Of Measurement Results

The problems of ensuring the unity of non-invasive blood pressure measurements are considered. It is shown that the artery and surrounding tissues of the body serve as a means of comparing the values of blood pressure and air pressure in the cuff, and that the metrological traceability of measurement results to pressure standards only partially determines the reliability of these results. The potential possibilities of the surface pulse wave method in comparison with the Korotkov tone method are estimated.

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